Poly(N-isopropylacrylamide) Microgels under Alcoholic Intoxication: When a LCST Polymer Shows Swelling with Increasing Temperature

被引：52

作者：

Backes, Sebastian ^{[1
,2
]}

Krause, Patrick ^{[1
]}

Tabaka, Weronika ^{[1
]}

Witt, Marcus U. ^{[1
,2
]}

Mukherji, Debashish ^{[3
]}

Kremer, Kurt ^{[3
]}

von Klitzing, Regine ^{[1
,2
]}

机构：

[1] Tech Univ Berlin, Stranski Lab Phys & Theoret Chem, Str 17 Juni 124, D-10623 Berlin, Germany

[2] Tech Univ Darmstadt, Inst Phys, Alarich Weiss Str 10, D-64287 Darmstadt, Germany

[3] Max Planck Inst Polymer Res, Ackermannweg 10, D-55128 Mainz, Germany

来源：

ACS MACRO LETTERS | 2017年 / 6卷 / 10期

关键词：

TO-COIL TRANSITION; N-ISOPROPYLACRYLAMIDE; THERMORESPONSIVE POLYMERS; PHASE-BEHAVIOR; PNIPAM; CONONSOLVENCY; HYDROGELS; DYNAMICS; CONFORMATION; NONSOLVENCY;

D O I：

10.1021/acsmacrolett.7b00557

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Poly(N-isopropylacrylamide) (PNIPAM) microgel is a smart polymer that shows a volume phase transition temperature (VPTT) at around 32 degrees C in aqueous solutions, above which it collapses. In this work, combining experiments and molecular simulations, it is shown that PNIPAM microgels do not always exhibit a collapsed structure above the VPTT. Instead, PNIPAM in aqueous alcohol mixtures shows a two-step conformational transition, i.e., a collapse at low temperatures (T < 32 degrees C) and a reswelling when T > 50 degrees C. The present analysis indicates that delicate microscopic interaction details, together with the bulk solution properties, play a key role in dictating the reswelling behavior. Even when PNIPAM microgels swell with increasing T, this is not a standard upper critical solution behavior.

引用

页码：1042 / 1046

页数：5

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